The measurement of anterior corneal surface topography before and during the occurrence of monocular diplopia can be used to predict the angular positions of any secondary images resulting from corneal distortion. The predictions correlate at a statistically significant level with direct measurements of the positions of the secondary images.

The basic concepts associated with thermal disinfection of contact lenses are examined, and the mathematical models used to predict the probability of survival of microsrganisms are described and applied to common ocular pathogens. Based on that examination, a review of the Australian Standard for moist heat disinfection of hydrogel contact lenses is recommended. The timetemperature profiles of several commercially available heat disinfection units are established, and their performance in comparison to both current and proposed standards is evaluated.

A proportion of optometric patients seek advice on the state and progress of lenticular opacities, the advisability and timing of cataract surgery and the forms of optical correction available for aphakia. To enable optometrists to better understand this condition and to advise patients appropriately, a simulation model for spectacle‐corrected aphakia was devised. This consists of a high minus contact lens worn in conjunction with compensating plus spectacle lenses.